CAREER: Experimental Studies of Granular Fluids

职业：颗粒流体的实验研究

• 批准号: 9874833
• 负责人: Narayanan Menon
• 金额: $ 34万
• 依托单位: University of Massachusetts Amherst
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-02-15 至 2004-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9874833&HistoricalAwards=false
• 关键词: CAREER; Experimental; Studies; Granular; Fluids

9874833MenonThis CAREER project comprises an experimental investigation of the dynamics of granular materials. The research will seek data describing granular flow. This information should aid development of models granular systems. At present there exists no well-established hydrodynamic description of the response of a granular system to external forces. Unlike the situation in conventional, correlations in spatial structure and dynamical quantities may play a significant role in granular flows. A first step to understanding these correlations involves experiments to study and control the dissipative interaction between grains. In parallel, homogeneously excited granular systems will be created via gravity-driven flow and high-amplitude, high-frequency oscillation. These two components will be united to create well-controlled uniform dynamical systems with tunable dissipation, to be studied by videomicroscopy, diffusing-wave spectroscopy, sound propagation and direct stress measurements with a view to discerning dynamical and spatial correlations. The research plan is structured to build in a significant role for undergraduate research. Some components of the program willdevolve into modules for undergraduate laboratory courses. Proposals for course development are defined which build on the research interests and training of the PI to meet departmental goals in an ongoing restructuring of the undergraduate program.%%%This CAREER project comprises an experimental investigation of the dynamics of granular materials. There exists no well-established description of the response of a granular system toexternal forces at the level of fluid mechanics for conventional liquids. This general question is of interest to a number of scientific communities including chemical and mechanical engineering, geophysics, applied mathematics as well as physics. Unlike the case of conventional fluid flows, correlations in spatial structure and dynamical quantities may play a very significant role in granular flows. The proposed experiments will study homogenous granular flows in which the energy losses are controllable, using a variety of optical techniques, sound propagation and force measurements with a view to discerning dynamical and spatial correlations. The research plan is structured to build in a significant role for undergraduate research with well-delineated projects for independent research. Some components of the program are designed to devolve into modules for undergraduate laboratory courses. Proposals for course development are defined which build on the research interests and training of the PI to meet significant departmental goals as part of an ongoing restructuring of the undergraduate program.***

9874833 Menon这个CAREER项目包括颗粒材料动力学的实验研究。这项研究将寻求描述颗粒流的数据。这些信息应该有助于模型粒度系统的开发。目前还没有一个完善的流体动力学描述的颗粒系统的响应外力。与传统的情况不同，空间结构和动力学量的相关性可能在颗粒流中起着重要的作用。 理解这些相关性的第一步涉及研究和控制颗粒之间耗散相互作用的实验。 同时，均匀激发的颗粒系统将通过重力驱动的流动和高振幅，高频率的振荡。 这两个组成部分将联合起来，创造良好的控制与可调耗散均匀的动态系统，进行研究，视频显微镜，扩散波光谱，声音传播和直接应力测量，以期辨别动态和空间的相关性。 研究计划的结构是建立在本科研究的重要作用。 该计划的一些组成部分将演变成本科实验室课程的模块。 课程开发的建议是建立在PI的研究兴趣和培训的基础上，以满足本科课程正在进行的重组中的部门目标。这个CAREER项目包括对颗粒材料动力学的实验研究。对于常规液体，在流体力学的水平上，还没有关于颗粒系统对外力的响应的成熟描述。这个一般性的问题是一些科学团体感兴趣的，包括化学和机械工程，物理学，应用数学以及物理学。与传统流体流动的情况不同，空间结构和动力学量的相关性可能在颗粒流动中发挥非常重要的作用。 拟议的实验将研究均匀的颗粒流，其中的能量损失是可控的，使用各种光学技术，声音传播和力的测量，以识别动态和空间的相关性。该研究计划的结构是建立在一个重要的作用，为本科生研究与精心划定的项目进行独立研究。 该计划的一些组成部分的目的是移交到本科实验室课程的模块。 课程开发的建议是建立在PI的研究兴趣和培训的基础上，以满足重要的部门目标，作为本科课程正在进行的重组的一部分。